b.Car Notice. When military shipments are loaded by or under the supervision of the military services on open-toprail equipment in accordance with drawings approved by the AAR, Mechanical Division, but which have not beenpublished in the Open Top Carloading Manual, a locally reproduced 5- x 7-inch notice (water repellent or otherwiseprotected from the elements) as fellows, will be prominently affixed to the car:The "authority" space on the notice will be completed by entering therein the drawing number or, if not available, theletter reference of the Mechanical Division, AAR.